Automatic Deluxe Fan-Tastic Ceiling Fan Vent
I do not know why stock RV fans are so noisy. Those little high speed fans sound like a jet engine taking of at times. You should think about replacing that noisy little monster with a super quiet FanTastic Ceiling Fan.
If you only got a quiet fan it would be a bargain, but the Fan-Tastic fan is more than quiet. It is a ceiling mounted, 3 speed, reversible fan. It only use 3 amps of 12 volt power when running on high.
The FanTastic fan will either draw in fresh cool outside air or reverse it and take hot air from a closed up RV. Cooking odors are wafted out quickly with the fan on high speed.
You can keep the fan running at night and the whisper quiet will let you get a comfortable nights sleep while at the same time cooling you RV.
FanTastic fans come in a variety of models from automatic thermostat controlled to manual operation.